Author(s): Goncalo Duarte; Paulo Branco; Gertrud Haidvogl; Didier Pont; Maria Teresa Ferreira; Pedro Segurado
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Abstract: Historical information on freshwater ecosystems is very important since there is a considerable knowledge gap about factors affecting the potential freshwater species distribution. Diadromous species have been noticeably declining at least for more than a century as a result of impactful human activities. Thus, information about their occurrence and distribution prior to these actions is essential. Long-term and large-scale historical data about freshwater organisms are rare. In Europe, most sources/databases are regional or national and with variable spatial coverage and resolution. With this work, we have created a method that can use multiple historical sources to create a coherent set of historical data with large spatial coverage, different levels of resolution, and for which sources were verified and cross-checked with each other.
Year: 2018